module HWProto

(

	handleCmd

) where

import IO

import Data.List

import Data.Word

import Data.Sequence(Seq, (|>), (><), fromList, empty)

import Data.Foldable(toList)

import Miscutils

import Maybe

import qualified Data.Map as Map

import Opts

teamToNet protocol team =

	if protocol <= 21 then

		["ADD_TEAM", teamname team, teamgrave team, teamfort team, show $ difficulty team] ++ hhsInfo

	else

		["ADD_TEAM", teamname team, teamgrave team, teamfort team, teamvoicepack team, teamowner team, show $ difficulty team] ++ hhsInfo

	where

		hhsInfo = concatMap (\(HedgehogInfo name hat) -> [name, hat]) $ hedgehogs team

makeAnswer :: HandlesSelector -> [String] -> [Answer]

makeAnswer func msg = [\_ -> (func, msg)]

answerClientOnly, answerOthersRoom, answerSameRoom :: [String] -> [Answer]

answerClientOnly  = makeAnswer clientOnly

answerOthersRoom  = makeAnswer othersInRoom

answerSameRoom    = makeAnswer sameRoom

answerSameProtoLobby = makeAnswer sameProtoLobbyClients

answerOtherLobby  = makeAnswer otherLobbyClients

answerAll         = makeAnswer allClients

answerBadCmd            = answerClientOnly ["ERROR", "Bad command, state or incorrect parameter"]

answerNotMaster         = answerClientOnly ["ERROR", "You cannot configure room parameters"]

answerBadParam          = answerClientOnly ["ERROR", "Bad parameter"]

answerErrorMsg msg      = answerClientOnly ["ERROR", msg]

answerQuit msg          = answerClientOnly ["BYE", msg]

answerNickChosen        = answerClientOnly ["ERROR", "The nick already chosen"]

answerNickChooseAnother = answerClientOnly ["WARNING", "Choose another nick"]

answerNick nick         = answerClientOnly ["NICK", nick]

answerProtocolKnown     = answerClientOnly ["ERROR", "Protocol number already known"]

answerBadInput          = answerClientOnly ["ERROR", "Bad input"]

answerProto protoNum    = answerClientOnly ["PROTO", show protoNum]

answerRoomsList list    = answerClientOnly $ "ROOMS" : list

answerRoomExists        = answerClientOnly ["WARNING", "There's already a room with that name"]

answerNoRoom            = answerClientOnly ["WARNING", "There's no room with that name"]

answerWrongPassword     = answerClientOnly ["WARNING", "Wrong password"]

answerCantAdd reason    = answerClientOnly ["WARNING", "Cannot add team: " ++ reason]

answerTeamAccepted team = answerClientOnly ["TEAM_ACCEPTED", teamname team]

answerTooFewClans       = answerClientOnly ["ERROR", "Too few clans in game"]

answerRestricted        = answerClientOnly ["WARNING", "Room joining restricted"]

answerConnected         = answerClientOnly ["CONNECTED", "Hedgewars server http://www.hedgewars.org/"]

answerNotOwner          = answerClientOnly ["ERROR", "You do not own this team"]

answerCannotCreateRoom  = answerClientOnly ["WARNING", "Cannot create more rooms"]

answerInfo client       = answerClientOnly ["INFO", nick client, host client, proto2ver $ protocol client, roomInfo]

	where

	roomInfo = if not $ null $ room client then "room " ++ (room client) else "lobby"

answerAbandoned protocol  =

	if protocol < 20 then

		answerOthersRoom ["BYE", "Room abandoned"]

	else

		answerOthersRoom ["ROOMABANDONED"]

answerChatString nick msg = answerOthersRoom ["CHAT_STRING", nick, msg]

answerAddTeam protocol team = answerOthersRoom $ teamToNet protocol team

answerRemoveTeam teamName = answerOthersRoom ["REMOVE_TEAM", teamName]

answerMap mapName         = answerOthersRoom ["MAP", mapName]

answerHHNum teamName hhNumber = answerOthersRoom ["HH_NUM", teamName, show hhNumber]

answerTeamColor teamName newColor = answerOthersRoom ["TEAM_COLOR", teamName, newColor]

answerConfigParam paramName paramStrs = answerOthersRoom $ "CONFIG_PARAM" : paramName : paramStrs

answerQuitInform nick msg =

	if not $ null msg then

		answerOthersRoom ["LEFT", nick, msg]

		else

		answerOthersRoom ["LEFT", nick]

answerPartInform nick = answerOthersRoom ["LEFT", nick, "bye room"]

answerQuitLobby nick msg =

	if not $ null nick then

		if not $ null msg then

			answerAll ["LOBBY:LEFT", nick, msg]

		else

			answerAll ["LOBBY:LEFT", nick]

	else

		[]

answerJoined nick   = answerSameRoom ["JOINED", nick]

answerRunGame       = answerSameRoom ["RUN_GAME"]

answerIsReady nick  = answerSameRoom ["READY", nick]

answerNotReady nick = answerSameRoom ["NOT_READY", nick]

answerRoomAdded name    = answerSameProtoLobby ["ROOM", "ADD", name]

answerRoomDeleted name  = answerSameProtoLobby ["ROOM", "DEL", name]

answerFullConfig room = concatMap toAnswer (Map.toList $ params room) ++ (answerClientOnly ["MAP", gamemap room])

	where

		toAnswer (paramName, paramStrs) =

			answerClientOnly $ "CONFIG_PARAM" : paramName : paramStrs

answerAllTeams protocol teams = concatMap toAnswer teams

	where

		toAnswer team =

			(answerClientOnly $ teamToNet protocol team) ++

			(answerClientOnly ["TEAM_COLOR", teamname team, teamcolor team]) ++

			(answerClientOnly ["HH_NUM", teamname team, show $ hhnum team])

answerServerMessage client clients = [\serverInfo -> (clientOnly, "SERVER_MESSAGE" :

		[(mainbody serverInfo) ++ updateInfo ++ clientsIn ++ (lastHour serverInfo)])]

	where

		mainbody serverInfo = serverMessage serverInfo ++

			if isDedicated serverInfo then

				"<p align=center>Dedicated server</p>"

				else

				"<p align=center>Private server</p>"

		updateInfo = if protocol client < 23 then "<font color=yellow><h3>Hedgewars 0.9.9 is out!!! Please, update. Support for previous versions will be dropped soon</h3><p align=center><a href=http://hedgewars.org/download.html>Download page here</a></p><h4>New features are:</h4><ul><li>Voice packs</li><li>Precise aim</li><li>RC Plane weapon</li><li>...</li></ul></font>" else ""

		clientsIn = if protocol client < 20 then "<p align=left>" ++ (show $ length nicks) ++ " clients in: " ++ clientslist ++ "</p>" else []

		clientslist = if not $ null nicks then foldr1 (\a b -> a  ++ ", " ++ b) nicks else ""

		lastHour serverInfo =

			if isDedicated serverInfo then

				"<p align=left>" ++ (show $ length $ lastHourUsers serverInfo) ++ " user logins in last hour</p>"

				else

				""

		nicks = filter (not . null) $ map nick clients

answerPing = makeAnswer allClients ["PING"]

-- Main state-independent cmd handler

handleCmd :: CmdHandler

handleCmd client _ rooms ("QUIT" : xs) =

	if null (room client) then

		(noChangeClients, noChangeRooms, answerQuit msg ++ (answerQuitLobby (nick client) msg) )

	else if isMaster client then

		(modifyRoomClients clRoom (\cl -> cl{isReady = False, partRoom = True}), removeRoom (room client), (answerQuit msg) ++ (answerQuitLobby (nick client) msg) ++ (answerAbandoned $ protocol client) ++ (answerRoomDeleted $ room client)) -- core disconnects clients on ROOMABANDONED answer

	else

		if not $ gameinprogress clRoom then

			(noChangeClients,

			modifyRoom clRoom{

				teams = othersTeams,

				playersIn = (playersIn clRoom) - 1,

				readyPlayers = newReadyPlayers

				},

			(answerQuit msg) ++

			(answerQuitInform (nick client) msg) ++

			(answerQuitLobby (nick client) msg) ++

			answerRemoveClientTeams)

		else

			(noChangeClients,

			modifyRoom clRoom{

				teams = othersTeams,

				leftTeams = (map teamname clientTeams) ++ (leftTeams clRoom),

				roundMsgs = (roundMsgs clRoom) >< (fromList rmTeamsMsgs),

				playersIn = (playersIn clRoom) - 1,

				readyPlayers = newReadyPlayers

				},

			(answerQuit msg) ++

			(answerQuitInform (nick client) msg) ++

			(answerQuitLobby (nick client) msg) ++

			answerRemoveClientTeams ++

			answerEngineTeamsRemoveMsg)

	where

		clRoom = roomByName (room client) rooms

		answerRemoveClientTeams = concatMap (\tn -> answerOthersRoom ["REMOVE_TEAM", teamname tn]) clientTeams

		(clientTeams, othersTeams) = partition (\t -> teamowner t == nick client) $ teams clRoom

		newReadyPlayers = if isReady client then (readyPlayers clRoom) - 1 else readyPlayers clRoom

		msg = if not $ null xs then head xs else ""

		rmTeamsMsgs = map (\team -> toEngineMsg $ 'F' : teamname team) clientTeams

		answerEngineTeamsRemoveMsg =

			if not $ null rmTeamsMsgs then

				answerOthersRoom $ "GAMEMSG" : rmTeamsMsgs

			else

				[]

handleCmd _ _ _ ["PING"] = -- core requsted

	(noChangeClients, noChangeRooms, answerPing)

handleCmd _ _ _ ["ASKME"] = -- core requsted

	(noChangeClients, noChangeRooms, answerConnected)

handleCmd _ _ _ ["PONG"] =

	(noChangeClients, noChangeRooms, [])

handleCmd _ _ _ ["ERROR", msg] =

	(noChangeClients, noChangeRooms, answerErrorMsg msg)

handleCmd _ clients _ ["INFO", asknick] =

	if noSuchClient then

		(noChangeClients, noChangeRooms, [])

	else

		(noChangeClients, noChangeRooms, answerInfo client)

	where

		maybeClient = find (\cl -> asknick == nick cl) clients

		noSuchClient = isNothing maybeClient

		client = fromJust maybeClient

-- check state and call state-dependent commmand handlers

handleCmd client clients rooms cmd =

	if null (nick client) || protocol client == 0 then

		handleCmd_noInfo client clients rooms cmd

	else if null (room client) then

		handleCmd_noRoom client clients rooms cmd

	else

		handleCmd_inRoom client clients rooms cmd

-- 'no info' state - need to get protocol number and nickname

onLoginFinished client clients =

	if (null $ nick client) || (protocol client == 0) then

		[]

	else

		answerLobbyNicks ++

		(answerAll ["LOBBY:JOINED", nick client]) ++

		(answerServerMessage client clients)

	where

		lobbyNicks = filter (\n -> (not (null n)) && n /= nick client) $ map nick $ clients

		answerLobbyNicks = if not $ null lobbyNicks then

					answerClientOnly $ ["LOBBY:JOINED"] ++ lobbyNicks

				else

					[]

handleCmd_noInfo :: CmdHandler

handleCmd_noInfo client clients _ ["NICK", newNick] =

	if not . null $ nick client then

		(noChangeClients, noChangeRooms, answerNickChosen)

	else if haveSameNick then

		(noChangeClients, noChangeRooms, answerNickChooseAnother)

	else

		(modifyClient client{nick = newNick}, noChangeRooms, answerNick newNick ++ (onLoginFinished client{nick = newNick} clients))

	where

		haveSameNick = isJust $ find (\cl -> newNick == nick cl) clients

handleCmd_noInfo client clients _ ["PROTO", protoNum] =

	if protocol client > 0 then

		(noChangeClients, noChangeRooms, answerProtocolKnown)

	else if parsedProto == 0 then

		(noChangeClients, noChangeRooms, answerBadInput)

	else

		(modifyClient client{protocol = parsedProto}, noChangeRooms, answerProto parsedProto ++ (onLoginFinished client{protocol = parsedProto} clients))

	where

		parsedProto = fromMaybe 0 (maybeRead protoNum :: Maybe Word16)

handleCmd_noInfo _ _ _ _ = (noChangeClients, noChangeRooms, answerBadCmd)

-- 'noRoom' clients state command handlers

handleCmd_noRoom :: CmdHandler

handleCmd_noRoom client clients rooms ["LIST"] =

		(noChangeClients, noChangeRooms, (answerRoomsList $ concatMap roomInfo $ sameProtoRooms))

		where

			roomInfo room = [

					name room,

					(show $ playersIn room) ++ "(" ++ (show $ length $ teams room) ++ ")",

					show $ gameinprogress room

					]

			sameProtoRooms = filter (\r -> (roomProto r == protocol client) && (not $ isRestrictedJoins r)) rooms

handleCmd_noRoom client _ rooms ["CREATE", newRoom, roomPassword] =

	if haveSameRoom then

		(noChangeClients, noChangeRooms, answerRoomExists)

	else

		(modifyClient client{room = newRoom, isMaster = True}, addRoom createRoom{name = newRoom, password = roomPassword, roomProto = (protocol client)}, (answerJoined $ nick client) ++ (answerNotReady $ nick client) ++ (answerRoomAdded newRoom))

	where

		haveSameRoom = isJust $ find (\room -> newRoom == name room) rooms

handleCmd_noRoom client clients rooms ["CREATE", newRoom] =

	handleCmd_noRoom client clients rooms ["CREATE", newRoom, ""]

handleCmd_noRoom client clients rooms ["JOIN", roomName, roomPassword] =

	if noSuchRoom then

		(noChangeClients, noChangeRooms, answerNoRoom)

	else if roomPassword /= password clRoom then

		(noChangeClients, noChangeRooms, answerWrongPassword)

	else if isRestrictedJoins clRoom then

		(noChangeClients, noChangeRooms, answerRestricted)

	else

		(modifyClient client{room = roomName}, modifyRoom clRoom{playersIn = 1 + playersIn clRoom}, (answerJoined $ nick client) ++ answerNicks ++ answerReady ++ (answerNotReady $ nick client) ++ answerFullConfig clRoom ++ answerTeams ++ watchRound)

	where

		noSuchRoom = isNothing $ find (\room -> roomName == name room && roomProto room == protocol client) rooms

		answerNicks = if not $ null sameRoomClients then

					answerClientOnly $ ["JOINED"] ++ (map nick $ sameRoomClients)

				else

					[]

		answerReady = concatMap (\c -> answerClientOnly [if isReady c then "READY" else "NOT_READY", nick c]) sameRoomClients

		sameRoomClients = filter (\ci -> room ci == roomName) clients

		clRoom = roomByName roomName rooms

		watchRound = if (roomProto clRoom < 20) || (not $ gameinprogress clRoom) then

					[]

				else

					(answerClientOnly  ["RUN_GAME"]) ++

					answerClientOnly ("GAMEMSG" : toEngineMsg "e$spectate 1" : (toList $ roundMsgs clRoom))

		answerTeams = if gameinprogress clRoom then

				answerAllTeams (protocol client) (teamsAtStart clRoom)

			else

				answerAllTeams (protocol client) (teams clRoom)

handleCmd_noRoom client clients rooms ["JOIN", roomName] =

	handleCmd_noRoom client clients rooms ["JOIN", roomName, ""]

handleCmd_noRoom client _ _ ["CHAT_STRING", msg] =

	(noChangeClients, noChangeRooms, answerChatString (nick client) msg)

handleCmd_noRoom _ _ _ _ = (noChangeClients, noChangeRooms, answerBadCmd)

-- 'inRoom' clients state command handlers

handleCmd_inRoom :: CmdHandler

handleCmd_inRoom client _ _ ["CHAT_STRING", msg] =

	(noChangeClients, noChangeRooms, answerChatString (nick client) msg)

handleCmd_inRoom client _ rooms ("CONFIG_PARAM" : paramName : paramStrs) =

	if isMaster client then

		(noChangeClients, modifyRoom clRoom{params = Map.insert paramName paramStrs (params clRoom)}, answerConfigParam paramName paramStrs)

	else

		(noChangeClients, noChangeRooms, answerNotMaster)

	where

		clRoom = roomByName (room client) rooms

handleCmd_inRoom client _ rooms ["PART"] =

	if isMaster client then

		(modifyRoomClients clRoom (\cl -> cl{isReady = False, isMaster = False, partRoom = True}), removeRoom (room client), (answerAbandoned $ protocol client) ++ (answerRoomDeleted $ room client))

	else

			if not $ gameinprogress clRoom then

				(modifyClient client{

					isReady = False,

					partRoom = True

					},

				 modifyRoom clRoom{

				 	teams = othersTeams,

				 	playersIn = (playersIn clRoom) - 1,

				 	readyPlayers = newReadyPlayers

				 	},

				 (answerPartInform (nick client)) ++ answerRemoveClientTeams)

			else

				(modifyClient client{

					isReady = False,

					partRoom = True

					},

				modifyRoom clRoom{

					teams = othersTeams,

					leftTeams = (map teamname clientTeams) ++ (leftTeams clRoom),

					roundMsgs = (roundMsgs clRoom) >< (fromList rmTeamsMsgs),

				 	playersIn = (playersIn clRoom) - 1,

				 	readyPlayers = newReadyPlayers

					},

				answerEngineTeamsRemoveMsg ++

				(answerPartInform (nick client)) ++

				answerRemoveClientTeams)

	where

		clRoom = roomByName (room client) rooms

		answerRemoveClientTeams = concatMap (\tn -> answerOthersRoom ["REMOVE_TEAM", teamname tn]) clientTeams

		(clientTeams, othersTeams) = partition (\t -> teamowner t == nick client) $ teams clRoom

		newReadyPlayers = if isReady client then (readyPlayers clRoom) - 1 else readyPlayers clRoom

		rmTeamsMsgs = map (\team -> toEngineMsg $ 'F' : teamname team) clientTeams

		answerEngineTeamsRemoveMsg =

			if not $ null rmTeamsMsgs then

				answerOthersRoom $ "GAMEMSG" : rmTeamsMsgs

			else

				[]

handleCmd_inRoom client _ rooms ["MAP", mapName] =

	if isMaster client then

		(noChangeClients, modifyRoom clRoom{gamemap = mapName}, answerMap mapName)

	else

		(noChangeClients, noChangeRooms, answerNotMaster)

	where

		clRoom = roomByName (room client) rooms

handleCmd_inRoom client _ rooms ("ADD_TEAM" : name : color : grave : fort : voicepack : difStr : hhsInfo)

	| length hhsInfo == 16 =

	if length (teams clRoom) == 6 then

		(noChangeClients, noChangeRooms, answerCantAdd "too many teams")

	else if canAddNumber <= 0 then

		(noChangeClients, noChangeRooms, answerCantAdd "too many hedgehogs")

	else if isJust findTeam then

		(noChangeClients, noChangeRooms, answerCantAdd "already has a team with same name")

	else if gameinprogress clRoom then

		(noChangeClients, noChangeRooms, answerCantAdd "round in progress")

	else if isRestrictedTeams clRoom then

		(noChangeClients, noChangeRooms, answerCantAdd "restricted")

	else

		(noChangeClients, modifyRoom clRoom{teams = teams clRoom ++ [newTeam]}, answerTeamAccepted newTeam ++ answerAddTeam (protocol client) newTeam ++ answerTeamColor name color)

	where

		clRoom = roomByName (room client) rooms

		newTeam = (TeamInfo (nick client) name color grave fort voicepack difficulty newTeamHHNum (hhsList hhsInfo))

		findTeam = find (\t -> name == teamname t) $ teams clRoom

		difficulty = fromMaybe 0 (maybeRead difStr :: Maybe Int)

		hhsList [] = []

		hhsList (n:h:hhs) = HedgehogInfo n h : hhsList hhs

		canAddNumber = 18 - (sum . map hhnum $ teams clRoom)

		newTeamHHNum = min 4 canAddNumber

handleCmd_inRoom client clients rooms ("ADD_TEAM" : name : color : grave : fort : difStr : hhsInfo) =

	handleCmd_inRoom client clients rooms ("ADD_TEAM" : name : color : grave : fort : "Default" : difStr : hhsInfo)

handleCmd_inRoom client _ rooms ["HH_NUM", teamName, numberStr] =

	if not $ isMaster client then

		(noChangeClients, noChangeRooms, answerNotMaster)

	else

		if hhNumber < 1 || hhNumber > 8 || noSuchTeam || hhNumber > (canAddNumber + (hhnum team)) then

			(noChangeClients, noChangeRooms, [])

		else

			(noChangeClients, modifyRoom $ modifyTeam clRoom team{hhnum = hhNumber}, answerHHNum teamName hhNumber)

	where

		hhNumber = fromMaybe 0 (maybeRead numberStr :: Maybe Int)

		noSuchTeam = isNothing findTeam

		team = fromJust findTeam

		findTeam = find (\t -> teamName == teamname t) $ teams clRoom

		clRoom = roomByName (room client) rooms

		canAddNumber = 18 - (sum . map hhnum $ teams clRoom)

handleCmd_inRoom client _ rooms ["TEAM_COLOR", teamName, newColor] =

	if not $ isMaster client then

		(noChangeClients, noChangeRooms, answerNotMaster)

	else

		if noSuchTeam then

			(noChangeClients, noChangeRooms, [])

		else

			(noChangeClients, modifyRoom $ modifyTeam clRoom team{teamcolor = newColor}, answerTeamColor teamName newColor)

	where

		noSuchTeam = isNothing findTeam

		team = fromJust findTeam

		findTeam = find (\t -> teamName == teamname t) $ teams clRoom

		clRoom = roomByName (room client) rooms

handleCmd_inRoom client _ rooms ["REMOVE_TEAM", teamName] =

	if noSuchTeam then

		(noChangeClients, noChangeRooms, [])

	else

		if not $ nick client == teamowner team then

			(noChangeClients, noChangeRooms, answerNotOwner)

		else

			if not $ gameinprogress clRoom then

				(noChangeClients, modifyRoom clRoom{teams = filter (\t -> teamName /= teamname t) $ teams clRoom}, answerRemoveTeam teamName)

			else

				(noChangeClients,

				modifyRoom clRoom{

					teams = filter (\t -> teamName /= teamname t) $ teams clRoom,

					leftTeams = teamName : leftTeams clRoom,

					roundMsgs = roundMsgs clRoom |> rmTeamMsg

					},

				answerOthersRoom ["GAMEMSG", rmTeamMsg])

	where

		noSuchTeam = isNothing findTeam

		team = fromJust findTeam

		findTeam = find (\t -> teamName == teamname t) $ teams clRoom

		clRoom = roomByName (room client) rooms

		rmTeamMsg = toEngineMsg $ 'F' : teamName

handleCmd_inRoom client _ rooms ["TOGGLE_READY"] =

	if isReady client then

		(modifyClient client{isReady = False}, modifyRoom clRoom{readyPlayers = newReadyPlayers}, answerNotReady $ nick client)

	else

		(modifyClient client{isReady = True}, modifyRoom clRoom{readyPlayers = newReadyPlayers}, answerIsReady $ nick client)

	where

		clRoom = roomByName (room client) rooms

		newReadyPlayers = (readyPlayers clRoom) + if isReady client then -1 else 1

handleCmd_inRoom client _ rooms ["START_GAME"] =

	if isMaster client && (playersIn clRoom == readyPlayers clRoom) && (not $ gameinprogress clRoom) then

		if enoughClans then

			(noChangeClients, modifyRoom clRoom{gameinprogress = True, roundMsgs = empty, leftTeams = [], teamsAtStart = teams clRoom}, answerRunGame)

		else

			(noChangeClients, noChangeRooms, answerTooFewClans)

	else

		(noChangeClients, noChangeRooms, [])

	where

		clRoom = roomByName (room client) rooms

		enoughClans = not $ null $ drop 1 $ group $ map teamcolor $ teams clRoom

handleCmd_inRoom client _ rooms ["TOGGLE_RESTRICT_JOINS"] =

	if isMaster client then

		(noChangeClients, modifyRoom clRoom{isRestrictedJoins = newStatus}, [])

	else

		(noChangeClients, noChangeRooms, answerNotMaster)

	where

		clRoom = roomByName (room client) rooms

		newStatus = not $ isRestrictedJoins clRoom